Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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• Item Name: WEVOPUR 323
• Manufacturer: WEVO-CHEMIE GmbH
• Technologies: Two-component unfilled polyurethane system with excellent flexibility and immediate miscibility of resin and hardener
• Color: Resin – black or as requested, Hardener – dark brown
• Cure Type: Ambient temperature, 12–24 hours; final hardness 10–14 days; pot life ~70 minutes at room temperature
• Package Size: 5 kg, 10 kg, 30 kg buckets; 200 kg drums
• Shelf Life: 6 months
WEVOPUR 323 is a two-component unfilled polyurethane encapsulating system with low viscosity. It exhibits excellent flexibility at low temperatures and good thermal endurance up to 130°C. The resin and hardener are immediately miscible. Service temperature ranges from -40°C to +130°C. The resin is used with WEVO-Hardener 300.
Encapsulation of pressure-sensitive electrical applications requiring high thermal endurance.
Suitable for sensors, small electronic assemblies, and other low/medium voltage devices.
| Property | Resin / Hardener | Mixed System |
|---|---|---|
| Viscosity (22°C) | Resin: 1,200 mPa·s / Hardener: 1,700 mPa·s | 700–800 mPa·s |
| Density (22°C) | Resin: 1,03 g/cm³ / Hardener: 1,06 g/cm³ | 1,20–1,24 g/cm³ |
| Mixing ratio (by weight) | 100 parts resin : 10 parts hardener | — |
| Pot life (150 g at RT) | — | ~70 min |
| Curing time | — | 12–24 h at RT |
| Final hardness | — | 10–14 days at RT |
| Color | Resin: black / Hardener: dark brown | Black/dark brown |
| Shore hardness A | — | 45–50 |
| Tensile strength | — | 1 N/mm² |
| Elongation at break | — | 48% |
| Modulus of elasticity | — | 3 N/mm² |
| Thermal conductivity | — | 0.2 W/m·K |
| Glass transition temperature | — | -51°C |
| Coefficient of thermal expansion | — | 68 ppm/K (< Tg), 268 ppm/K (> Tg) |
| Thermal class | — | B |
| Shrinkage after curing | — | 4.1% |
| Water absorption (30 days) | — | 0.7% |
| Flammability | — | HB (UL94) |
| Dielectric strength | — | 19 kV/mm |
| Volume resistivity | — | 7.1·10¹⁰ Ω·cm |
| Surface resistance | — | 6.4·10¹⁴ Ω |
| Dielectric constant ε | — | 7.4 (50 Hz), 7.2 (1 kHz), 6.1 (1 MHz) |
| Dissipation factor tan δ | — | 0.285 (50 Hz), 0.029 (1 kHz), 0.073 (1 MHz) |
| CTI | — | 600 |
| Packaging | — | 5, 10, 30 kg buckets; 200 kg drums |
| Shelf life | — | 6 months (closed, dry storage 15–25°C) |
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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